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Glossary of L14

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The nerve you will dissect (together with the muscle) in this week's lab is named the ___________ nerve.
sciatic
The muscle to used in the experiment this week is called the ________________.
gastrocnemius muscle
To measure muscle force, the muscle is attached to a device called a ________ __________ (2 words) that reports a voltage proportional to the force to the A/D converter.
tension transducer
The tension response to a single stimulus of the nerve is known as a _______________.
twitch
A single motor neuron and all the muscle fibers that neuron innervates is known as a ________ _________.
motor neuron
If the nerve is stimulated repetitively, the maximum force produced is __________ (choose more, less, or the same as) the tension generated by a single stimulus.
more
When examined under the microscope, the muscle contains alternating light and dark bands. The dark band is known as the _____ band. The light band is known as the _____ band.
A/ i
In the middle of the light band is a line known as the _____ line.
Z
The repeating unit from one line in one light band to the next line in the next light band is known as the ______________.
H zone
The muscle contracts in response to stimulation of the nerve because the nerve terminals liberate a neurotransmitter known as _____________, that binds to receptors in the muscle membrane, depolarizes the muscle membrane past threshold, causing it to gen
acteylcholine/ action potential
The major contractile proteins of muscle are known as ________ and ________.
actin and myosin
A protein that negatively regulates muscle contraction by preventing interaction between the major contractile proteins is ________________.
tropomyosin
The negative regulation of filament sliding is owed to the release of ________ ions from the _____________ reticulum.
Ca2+/ sarcoplasmic
Muscle relaxation occurs when the ______ ions are pumped back into the __________ reticulum.
Ca2+/ sarcoplasmic
The amount of tension generated by a muscle can be varied by the nervous system by determining the number of simultaneously active ________ units and the _________ at which each of these units is firing.
motor/ frequency
The maximum response of a muscle to repetitive stimulation is known as a ________.
tetanus

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